<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!-- js -->
    <script src="./index.js"></script>
    <script src="./homework.js"></script>
    <!-- CSS -->
    <style>
        *{
            margin: 0; padding: 0;
        }
        div{
            text-align: center;
        }
    </style>
</head>

<body>
    <div>
        省级：<select name="" id="province">
            <option value="">请选择省份</option>
        </select>
        市级：<select name="" id="city">
            <option value="">请选择城市</option>
        </select>
        区级：<select name="" id="county">
            <option value="">请选择地区</option>
    </div>
</body>

</html>‰